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  • 1
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    Three-dimensional boundary-layer transition on a cone at Mach 3.5 (1992)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-24
    Beschreibung: A boundary-layer transition study on a sharp, 5 deg half-angle cone at various angles of attack was conducted at Mach 3.5. Transition data were obtained with and without significantly reduced freestream acoustic disturbance levels. A progressive downstream and upstream motion of the transition front on the windward and leeward rays, respectively, of the cone with angle of attack was observed for the high noise level data in agreement with data trends obtained in conventional ('noisy') wind tunnels. However, the downstream movement was not observed to the same degree for the low noise level data in the present study. Transition believed to be crossflow dominated was found to be less receptive to freestream acoustic disturbances than first-mode (Tollmien-Schlichting) dominated transition. The previously-developed crossflow transition Reynolds number criterion was found to be inadequate for the current case. An improved criterion is offered, which includes compressibility and flow-geometry effects.
    Schlagwort(e): AERODYNAMICS
    Materialart: Experiments in Fluids (ISSN 0723-4864); 13; 5; p. 305-314.
    Format: text
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  • 2
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    Compounds in airborne particulates - Salts and hydrocarbons (1977)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: Concentrations of 10 polycyclic aromatic hydrocarbons (PAH), the aliphatics as a group, sulfate, nitrate, fluoride, acidity, and carbon in the airborne particulate matter were measured at 16 sites in Cleveland, OH over a 1-year period during 1971 and 1972. Analytical methods used included gas chromatography, colorimetry, and combustion techniques. Uncertainties in the concentrations associated with the sampling procedures, and the analytical methods are evaluated. The data are discussed relative to other studies and source origins. High concentrations downwind of coke ovens for 3,4 benzopyrene are discussed. Hydrocarbon correlation studies indicated no significant relations among compounds studied.
    Schlagwort(e): ENVIRONMENT POLLUTION
    Materialart: Air Pollution Control Association; vol. 27
    Format: text
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  • 3
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    Elemental composition of airborne particulates and source identification - An extensive one year survey (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Concentrations of 60 chemical elements in the airborne particulate matter were measured at 16 sites in Cleveland, OH over a 1 year period during 1971 and 1972 (45 to 50 sampling days). Analytical methods used included instrumental neutron activation, emission spectroscopy, and combustion techniques. Uncertainties in the concentrations associated with the sampling procedures, the analytical methods, the use of several analytical facilities, and samples with concentrations below the detection limits are evaluated in detail. The data are discussed in relation to other studies and source origins. The trace constituent concentrations as a function of wind direction are used to suggest a practical method for air pollution source identification.
    Schlagwort(e): ENVIRONMENT POLLUTION
    Materialart: Air Pollution Control Association; vol. 26
    Format: text
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  • 4
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    Comparison of earth rotation as inferred from radio interferometric, laser ranging and astrometric observations (1983)
    In:  Other Sources
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    Publikationsdatum: 2019-06-28
    Beschreibung: Results of measurements of the earth's rotation vector for a 400-day period from late September 1980 to December 1981, for which date from VLBI, satellite laser ranging (SLR), and lunar laser ranging (LLR) were available, are compared. The acquisition of the data and their evaluation are described. VLBI, SLR, and classical astrometric determinations of the X-parameter required to describe the location of the rotation pole on the earth's surface are shown, and VLBI, LLR, and classical astrometric determinations of the angle of rotation about this pole (UT1) are presented. The results indicate that VLBI and SLR, at their present stages of development, yield standard errors under 20 cm in the determinations of X, about twofold smaller than obtained from classical measurements, and that VLBI and LLR yield determination of UT1 with standard errors less than 40 cm, somewhat smaller than that of the corresponding determinations from classical observations. Methods for improving these types of intercomparisons are suggested.
    Schlagwort(e): GEOPHYSICS
    Materialart: Nature (ISSN 0028-0836); 302; April 7
    Format: text
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  • 5
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    Atmospheric study relating to pad lift-off and entry landing (1977)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A relationship between the atmospheric general circulation and geophysical hydrodynamic experiments was sought by attempting to find a relationship between wave number and temperature gradient at mid-latitudes at 500 mb. To this end data were gathered from four winter seasons and analyzed. The statistical analysis failed to provide convincing support for the hypothesis of a direct relationship between wave number and temperature gradient, although an indication that the transient waves may be so related was noted.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA-CR-150621 , SAI-78-780-HU
    Format: application/pdf
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  • 6
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    Concentrations of trace elements and compounds in the airborne suspended particulate matter in Cleveland, Ohio, from August 1971 to August 1972 and their dependence on wind direction: Complete data listing and concentration roses (1976)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Concentrations of 75 chemical constituents in the airborne particulate matter were measured in Cleveland, Ohio during 1971 and 1972. Daily values, maxima, geometric means and their standard deviations covering a 1-year period (45 to 50 sampling days) at each of 16 sites are presented on microfiche for 60 elements, and for a lesser number of days for 10 polycyclic aromatic hydrocarbon compounds (PAH), the aliphatic hydrocarbon compounds (AH) as a group and carbon. In addition, concentration roses showing directional properties are presented for 39 elements, 10 PAH and the AH as a group. The elements (except carbon) are shown both in terms of concentration and percentage of the suspended particulate matter.
    Schlagwort(e): ENVIRONMENT POLLUTION
    Materialart: NASA-TM-X-73453 , E-8795
    Format: application/pdf
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  • 7
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    Analysis of distortion data from TF30-P-3 mixed compression inlet test (1976)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A program was conducted to reduce and analyze inlet and engine data obtained during testing of a TF30-P-3 engine operating behind a mixed compression inlet. Previously developed distortion analysis techniques were applied to the data to assist in the development of a new distortion methodology. Instantaneous distortion techniques were refined as part of the distortion methodology development. A technique for estimating maximum levels of instantaneous distortion from steady state and average turbulence data was also developed as part of the program.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-CR-2686
    Format: application/pdf
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  • 8
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    Extensive 1-year survey of trace elements and compounds in the airborne suspended particulate matter in Cleveland, Ohio (1976)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Concentrations of 75 chemical constituents in the airborne particulate matter were measured in Cleveland, Ohio, during 1971 and 1972. Values covering a 1-year period (45 to 50 sampling days) at each of 16 sites are presented for 60 elements. A lesser number of values is given for sulfate, nitrate, fluoride, acidity, 10 polynuclear aromatic hydrocarbon compounds, and the aliphatic hydrocarbon compounds as a group. Methods used included instrumental neutron activation, emission spectroscopy, gas chromatography, combustion techniques, and colorimetry. Uncertainties in the concentrations associated with the sampling procedures, the analysis methods, the use of several analytical facilities, and samples with concentrations below the detection limits are evaluated in detail. The data is discussed in relation to other studies and source origins. The trace constituent concentrations as a function of wind direction are used to suggest a practical method for air pollution source identification.
    Schlagwort(e): ENVIRONMENT POLLUTION
    Materialart: NASA-TN-D-8110 , E-8173
    Format: application/pdf
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  • 9
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    Airfoil section drag reduction at transonic speeds by numerical optimization (1976)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A practical procedure for the design of low drag, transonic airfoils is demonstrated. The procedure uses an optimization program, based on a gradient algorithm coupled with an aerodynamic analysis program, that solves the full, non-linear potential equation for transonic flow. The procedure is useful for the design of retrofit modifications for drag reduction of existing aircraft as well as for the design of low drag profiles for new aircraft. Results are presented for the modification of four different airfoils to decrease the drag at a given transonic Mach number.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-X-73097 , A-6407
    Format: application/pdf
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  • 10
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    Aerodynamic size distribution of suspended particulate matter in the ambient air in the city of Cleveland, Ohio (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The City of Cleveland Division of Air Pollution Control and NASA jointly investigated the chemical and physical characteristics of the suspended particulate matter in Cleveland, and as part of the program, measurements of the particle size distribution of ambient air samples at five urban locations during August and September 1972 were made using high-volume cascade impactions. The distributions were evaluated for lognormality, and the mass median diameters were compared between locations and as a function of resultant wind direction. Junge-type distributions were consistent with dirty continental aerosols. About two-thirds of the suspended particulate matter observed in Cleveland is less than 7 microns in diameter.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA-TM-X-3124 , E-8024
    Format: application/pdf
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